I have fitted a few sets,Sapphire,mk3 cab,novas etc over the years.The Sapp by the way was the easiest to get the transducer to work.The car was a ghia and had fuel computer and it had a two piece speedo cable with a pick up on the bulkhead. I just fastened it on there.The speed was way out but I found that swithing it from mph to km showed a true mph reading !!.